Use markdown in README and display travis-ci build status for master branch.

Signed-off-by: Mariusz Fik <fisiu@opensuse.org>

README.md

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+qBittorrent - A BitTorrent client in Qt4
+------------------------------------------
+
+[![Build Status](https://travis-ci.org/qbittorrent/qBittorrent.png?branch=master)](https://travis-ci.org/qbittorrent/qBittorrent)
+********************************
+###Description:
+qBittorrent is a bittorrent client programmed in C++ / Qt4 that uses
+libtorrent (sometimes called rblibtorrent) by Arvid Norberg.
+
+It aims to be a good alternative to all other bittorrent clients
+out there. qBittorrent is fast, stable and provides unicode
+support as well as many features.
+
+This product includes GeoLite data created by MaxMind, available from
+http://maxmind.com/
+
+### Installation:
+For installation, follow the instructions from INSTALL file, but simple:
+
+```
+./configure
+make && make install
+qbittorrent
+```
+
+will install and execute qBittorrent hopefully without any problem.
+
+For more information please visit:
+http://www.qbittorrent.org
+
+or our wiki here:
+http://wiki.qbittorrent.org
+
+Please report any bug (or feature request) to:
+http://bugs.qbittorrent.org
+
+You can also meet me (chris-qBT) on IRC:
+`#qbittorrent on irc.freenode.net`
+
+------------------------------------------
+Christophe Dumez <chris@qbittorrent.org>
+